Mercurial > repos > other > adventofcode2023
diff day1.rb @ 0:76cc43966538
Start https://adventofcode.com/2023/day/1 in Ruby
Part B was nasty because it didn't explain how to handle
overlapping numbers, which was occasionally important for
the last number.
| author | IBBoard <dev@ibboard.co.uk> |
|---|---|
| date | Fri, 01 Dec 2023 20:00:22 +0000 |
| parents | |
| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/day1.rb Fri Dec 01 20:00:22 2023 +0000 @@ -0,0 +1,20 @@ +#! /usr/bin/env ruby + +if ARGV.length != 1 + abort("Incorrect arguments - pass a single file") +elsif not File.exist? (ARGV[0]) + abort ("File #{ARGV[0]} did not exist") +end + +file = ARGV[0] +sum = 0 +File.open(file, "r").each_line do |line| + match = /^[^0-9]*([0-9]).*?(([0-9])[^0-9]*)?$/.match(line) + if match + first_num = match[1].to_i + second_num = match[3].nil? ? first_num : match[3].to_i + sum += (first_num * 10) + second_num + end +end + +puts sum \ No newline at end of file